ALGARNI, Eman. Distances to Planetary Nebulae Using Astrometric Data of Gaia DR2. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 54, n. 4, p. 80–110, 2020. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/11904. Acesso em: 12 oct. 2025.